Posted by **Jen ** on Saturday, October 31, 2009 at 3:17pm.

A 125 kg fullback is running at 5.0 m/s to the east and is stopped in 0.75 s by a head-on tackle by a tackler running due west.

a) Calculate the original momentum of the fullback.

i did this and got 625 kg- m/s

b) Calculate the impulse exerted on the fullback

i did this and got 625

(c) Calculate the impulse exerted on the tackler.

I did this and got 625 but D I CANT FIGURE OUT !!!

(d) Calculate the average force exerted on the tackler.

- Physics -
**bobpursley**, Saturday, October 31, 2009 at 3:19pm
d) force*time=changeinmomentum

since you dont have time of impact, you cant do it.

other answers: momentum and impulse are vectors, you didn't indicate direction.

- Physics -
**John**, Wednesday, February 27, 2013 at 2:53pm
Since the unit for force, a newton is equal to kg*m/s^2 you must divide the momentum, kg*m/s of the player by the time it took for him to be tackled.

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